A general question we ask in this paper is the following: where do physical theories land in the space of couplings that satisfy the bounds from causality, unitarity and crossing?
In this section we review general properties of the gravitational amplitudes relevant for the derivation of the bounds. In subsequent sections we then proceed with the derivation of various bounds on the Wilson coefficients, following the recent developments of Refs. [1]}, [2]}, [3]}, [4]}, [5]}. Finally, we check that the results presented in the paper satisfy the expected bounds and analyze the region in the space of couplings covered by known theories.
